摘要
为探讨不同性质表面活性剂对材料结构的影响,以4种常用的表面活性剂为模板,在相同的条件下制备出性能各异的铝掺杂二氧化钛(Al-TiO2)粉体材料。并对材料的微结构和组成进行了表征与分析。结果表明,表面活性剂疏水基团所含碳原子数与Al-TiO2粉体的微晶尺寸呈负相关性,与晶格应力呈正相关性。表面活性剂诱导Al3+进入TiO2晶格的质量分数越大,晶格应力越大。Al-TiO2粉体材料的可见光降解吡啶的性能主要是由表面活性剂本身特定的分子结构及其所导致的氧空位浓度大小来决定,而不是能带间隙的宽窄来决定。阴离子表面活性剂对材料的微结构有很大的调控作用,其中SDS为最大;阳离子表面活性剂CTAB次之,两性表面活性剂对材料性能的调控没有优异表现。
To investigate the effect of various surfactants on the microstructure, four surfactants were used as templates to prepare Al doped titanium dioxide （Al-TiO2 ） powder with varied properties under the same conditions. The materials＇ microstructures and composition were characterized and analyzed. The results show that the carbon atomicity of hydrophobic groups in surfactant has a negative correlation with the crystallite size of A1-TiO2 powder and a positive correlation with the distorting stress. Moreover, the more the mass fraction of A13 ＋ entering TiO2 crystal lattice induced by the surfactant, the more the distorting stress produced by crystal lattice is. The visible light degradation property of pyridine on the A1-TiO2 powder surface is mostly determined by the molecular structure of surfactant and thus the oxygen vacancy concentration induced by surfactant rather than by the band gap width. In the control range of anion surfactant on the materials＇ structure, SDS is stronger than cation surfactant, but the ampholytic surfactant is poor.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2013年第12期1359-1365,共7页
Fine Chemicals
基金
贵州省自然科学基金资助项目(黔科合J字[2010]2006
黔科合J字[2011]2315)
贵州省材料物理与化学特色重点学科建设基金(黔教高发[2011]208)
贵州省教育厅市州地普通本科高校教育质量提升科研项目(黔教高发[2011]278)
贵州省特色重点实验室建设基金(黔财教[2012]225)~~
